Priority package rates refer to the shipping costs associated with sending packages through expedited services like USPS Priority Mail, FedEx Priority, or UPS Next Day Air. These rates are higher than standard shipping options but ensure faster delivery. For example, USPS Priority Mail starts at $7.70 for small flat-rate packages, with prices increasing based on weight and distance for non-flat-rate options. Businesses often use priority services to meet customer expectations for quick deliveries.